Differential driving arrangement



July A3.1, 1928.

A. N. sl-AIAHPAR DIFFERENTIAL DRIVING ARRANGEMENT Filed July 1, 1927 2 Sheets-Sheet l ATTORNEY.

f//l/A July 31, 192s.

1,679,098 A. N. SHAHPAR DIFFERENTIAL DRIVING ARRANGEMENT Filed July 1, 1927 2 Sheets-Sheet 2 INVEN TOR.

` ATTORNEY.

Patented July 31, 1,928.

PATENT -orfrlclag AHMAD N. SHAHPR, QF HIGHLAND PARK, MICHIGAIN.

DIFFERENTIAL DRIVING ARRANGEMENT.

Application iled'July 1, 1927. Serial No. 202,785.y

This invention relates to improvements in differential driving arrangements, and refers more particularly to an arrangement applicable to driving wheels having crank pins thereon each of which is driven from a separate cylinder. .v

It is an object of the invention to provide dilerent-ial driving arrangements tor vehicles intended to make sharp turns, and

i lmore particularly for vehicles intended to travel on roads whereon rails are provided for them. l

Another object. of the inventionV isto provide a differential driving arrangement wherein powerl from cylinders is transmitted through two separa-tedifferentialsv andl two cross shafts through gearing to two annular driving Wheels, andwherein the weight on the driving wheels is imparted to them troin carrying wheels'mounted on a separate axle.

A further object ofv the invention is to provide a differentialy driving arrangement-l wherein means are provided for maintaining a constant distance between the cross shafts andthe carrying axle at all times so that the gears which cooperate with the. annular driving wheels always remain in mesh with the latter. v

Yet another object of the invention is to provide a differential driving arrangement wherein means are provided for equalizing the speed of rotation of both gears which drive one annular driving wheel, and a secnd similar means for equalizing the speed of rotation of the other two gears which drive the other annular driving wheel; though the speed of rotation of the two pairs of gears, and therefore of the two driving wheels may diner from one another.

With these and other objects in view which will become apparent as the specilication proceeds, the invention is hereinafter more fully described with the aid ot the accompanying drawings, in which:

Figure 1 illustrates a side elevation of the invention, and f Figure 2 shows a. plan view.

Figure 3 is a section on the line 3-3 ot Figure 1.

Figure 4 shows a sec-tion on the line 4-4 of Figure .3.

Figure 5 shows a section on the linee-5- of Figure 1.v

the line of 'outside ot each of the trames 1.

The driving wheels consist of annular members 7 each of which have Iinternal gears 8 and 8a thereon. Between the gears 8 and 8fL internal 4circular bearing surfaces 9v are provided which are of less diameter than the said gears; f f I i On each of the side frames 1 a sub-stantially triangular support 10 is `'resilient-ly mounted. Thebases 11 of lthese supports are usually of angle section; between the horizontal base portions 12 and the tops of the framessinuo'us springs 13l are arranged, and the bases areheld on the frames preferably by bolts 14 which pass through openings 13LL through the sinuous springs, have coil spring 15 between the undersides of their heads and the top ot the horizontal base portions, and are in threaded engagement with holes in the upperside ot the frames. Integral with the horizontal base portions 12 are downwardly extending vertical portions 16 which depend below the top of the frames yon the outer sides of the latter, and

substantially centrally of their length these portions 16 have downwardly extending aprons 17 thereon wit-h openings 18 therethrough. In the ends ot' the `'supports adj acent to their bases bea-rings 19 are provided for cross shafts 20, and at' the apexes of the supports outwardly extending stub shafts 21 are provided.

Loosely mounted on the outer ends of the transverse shafts arev discs 22, each of which has an outwardly projectingcrank pin 23 thereon to receive the oppositeend of its connecting rod 6. `Integral with eachv disc v is an 'inwardly' projecting cage 24. Each cage carries a pluralityy of rollers 25 therein which are heldin' spaced relation to one another; these rollers have radial recesses 26 take into the roller recesses. The'iollers i also bear on the vbore of the power gears 29,

each of which is in mesh with one set of lriving gears 8 and 8,"`so that their internal teet-h or projections 30 also take into the roller recesses 26. ln this connection it ivill be noted that the rollers are inclined at an angle to the discs 22 so as to facilitate the assembly of the rollers, poivcr gears and driving plates. Moreover the rotation ot 'the discs 22 and their cages 2t causes the rollers to turn about the axes of the shafts 2O and at the sanietiine the rollers are free to turn about their own axes so` that the speed of rotation imparted to the plates 2T and to the power gears 2st is variable.

On the shafts 20, at-their ends remote from their crank pins, fixed gears 30 are secured, each of which meshes With one set of internal driving gears 8 and S, and on the shafts 2() adjacent both tothe iixed gears 3() and to the power gears 29 sprocket Wheels 31 are arranged. It 1vvill be noted that the sprocket Wheels adjacent to the power gears are secured to' the latter and are free to rotate on the shafts 20, Whereas the sprocket Wheels adjacent to the lined 'gears are so mounted o-n the shafts 2O as tolrotate with them as the lined gears do., Onthe stub shaft- 21 idler gears S2 are freely mounted which also mesh with the gears 8 and 8a. Integral with the idler gears 32 are sleeves 33 on which sprocket Wheels are secured so that the said sprocket Wheels and idler gears rotate together. Around the three sprocket Wheels V5l, 34, and 3l on eachsupport a ,driving chain 35 is arranged so as to insure uniform speed of rotation of each set of three gears 29, 30 and 32, though the speed of rotation ofthe two sets may vary. It will also be noted that each set of three gears 29, 30 and 32 are positioned substantially at 120 .degrees to one another so that their relative positions tend to prevent radial movement of the annular driving wheels.

if In the frames conventional axle boxes 86 are provided for carrying an aXle 3'?. On the ends of the latter carrying Wheels 38 are arranged. Y These wheels have annular grooves 39 in their peripheries which bear on the circular bearing surfaces 9 of the an` nular Wheels. The side faines l are sup e ported by springs ll0 secured also to the aide boxes, and in order that the distance between the centre' of the carrying axle and the 'driving shafts 20 shall remain constant at diej-bases ofthevsupports '10. i .j

lVhile in the foregoing the preferred. eni

bodiment of the invention has been described and shown, it is understood that the construction is susceptible to such modifications as fall Within the scope of the appended claims.

Vfhat I claim as my invention and desire to secure by Letters Patent is:

l. An arrangement of the character described con'iprising annular driving Wheels having internal gears therein, cross shafts Ventending through both of said Wheels, gears on each cross shaft meshing with said internal gears, a differential drive on each cross shaft so that the speed of rotation of `the gears on the opposite ends of said shafts may vary/stub shafts, an idler gear on each stub shaft meshing with one of said internal gears, means for imparting power to saidr idler gears so that both` the gears and the idler gear cooperating with each internal gear all impart an equal amount of power thereto, an axle, carrying wheels on said axle, internal annular flanges in said driving Wheels against Which said carrying Wheels are adapted to turn, and separate means for operating eachV dierential drive.

2. ln an arrangement of the character def scribed, the combination With side frames having axle boxes mounted therein, an axle Supported by saidboxes, and springs connecting said boxes With said side frames, of

annular ldriving Wheels having internalV gears therein, cross shafts extending through both of said Wheels, gears on each cross shait meshing with said internal gears,

a differential drive on each cross shaft so that the speed of rotation of the gears on the opposite ends of said shafts Ymay vary, means for maintaining an equal speed of rotation of all gears that coact With each internal gear, carrying wheels on said axle, internal annular flanges in saiddriving Wheels against which said carrying Wheels are adapted to turn, separate means for operating each differential drive, and means for maintaining constant distances between the centres of the cross sliafts and the axle at all times.

3. In an arrangement as described in claiin 2, the combination wherein the means for maintaining constant distances between the centres of the cross shafts and the aide consists of supports on the side frames in which the cross shafts are mounted, depending aprons integral ivith supports which `take around said axle, and resilient support ing means on said frames for said supports.

4t. ln an arrangement ofthe character described, the combination of sideframes having supports mounted thereon, cross shafts mounted in said supports, axle boxes in said lframe, a carrying axle mounted `in said boxes, annular driving Wheels having'internal gears, a disc revolvably mounted on each cross shaft, said. discs beiiiig diagonally opposite to one another, crank pins in said discs, a cage on each disc, a plurality of circularly arranged rollers having radial recesses therein rotatably supported by cach cage, a circular plate having projections on its periphery fixed on each shaft, said projections engaging said roller recesses, a power gear around each set of rollers having projections in its bore engaging said roller recesses, Vfixed gears on the opposite ends of said shafts, said power gears and said fixed gears meshing with said internal gears, means for maintaining equal speed of rotation oi' the power and lined gears that mesh with each internal gear, carrying wheels 'on said axle, and internal annular flanges in said driving Wheels against which said carryingl Wheels arel adapted to rotate.

5. In an arrangement of the character Wheels are adapted to rotate, a stub shaft on each support, idler gears on saidstub sha ts meshing with said internal gears, and means for turning said idler gears and for equalizing the speed o1 rotation of all the gears that coact with each internal gear.

l AHMAD. N. SHAHPARV. 

